row_number()、over()、insert into及group by 测试-sqlserver2008-201203230859

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CREATE TABLE [dbo].[tb6](
[a] [varchar](5) NULL,
[b] [varchar](5) NULL
) ON [PRIMARY]
insert into tb6 values('a',null)
insert into tb6 values('a',null)
insert into tb6 values('b',null)
insert into tb6 values('b',null)
insert into tb6 values('b',null)
insert into tb6 values('c',null)
insert into tb6 values('c',null)
CREATE TABLE [dbo].[tb7](
[a] [varchar](5) NULL,
[b] [varchar](5) NULL
) ON [PRIMARY]
insert into tb7 select a,b=row_number()over(order by a) from tb6
select * from tb7
select *,COUNT(*) from tb7 group by a,b

row_number()、over()、insert into及group by 测试-sqlserver2008-201203230859
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